package io.dbw.modules.utils;

import com.alibaba.fastjson.JSONObject;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;
import java.security.Security;

public class WXUtils {

    public static JSONObject getUserInfo(String encryptedData, String sessionKey, String iv){
        // 被加密的数据
        byte[] dataByte = Base64.decode(encryptedData);
        // 加密秘钥
        byte[] keyByte = Base64.decode(sessionKey);
        // 偏移量
        byte[] ivByte = Base64.decode(iv);

        try {
            // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
            int base = 16;
            if (keyByte.length % base != 0) {
                int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);
                byte[] temp = new byte[groups * base];
                Arrays.fill(temp, (byte) 0);
                System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
                keyByte = temp;
            }
            // 初始化
            Security.addProvider(new BouncyCastleProvider());
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");
            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));
            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, "UTF-8");
                return JSONObject.parseObject(result);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void main(String[] args) {
        String data="kc9IEO7hnTeu4beyt8wfF3JlvBA8SdPRorHE8RU72OID5Z6P46jiBYQEZYS0f49o7UC7seC6LhrEZTE+01PWVKDKsBQ6GVgreIDw6WawudmRGA17VI6FayNhUmBo0JEtE9DepGRL+YejOAhgolubS54w2TF0KHgLmrLEbdUOLK6yeqy58o1So19SfU6tp5NEl+v4VNddBstYbNnsJ+s/kw==";
        String iv="hpqN8fD2pCm8/FlgHPAppw==";
        JSONObject jsonObject= getUserInfo(data,"NUEqZc57VY126W331d69pw==",iv);
        System.out.println(jsonObject.getString("phoneNumber"));
        System.out.println(jsonObject.toJSONString());

    }
}
